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while the perforated stainless-steel ballast guard helps prevent soil and debris from entering the drain
bronze disc
Specifications Body Material Fiberglass Brand Watts Color Grey For Valve With Strainer No Heated Yes Insulated Yes Mounting Pad Size 36 x 22 IN Specification Sheet - WattsBox
The low pressure range is 10 to 35 psi (69 to 241 kPa) with the standard setting at 30 psi (207 kPa)
Watts 957N-NRS 10 - Part of the 957 Series inlet-protection-finder while the perforated stainless-steel ballastThis 10 inch reduced pressure zone assembly backflow preventer helps prevent the reverse flow of fire protection substances and water of non potable quality from being pumped or siphoned into the potable water supply due to backsiphonage and or backpressure in accordance with national plumbing codes and water authority requirements. This extremely compact and lighter than a traditional designed assembly is approved for horizontal N pattern